update edge dockerfile

Author: DannyBen

edge/Dockerfile

@@ -7,8 +7,8 @@ ARG branch=master
 
 WORKDIR /bashly
 RUN git clone --branch $branch --depth 1 https://github.com/DannyBen/bashly.git .
-RUN gem build bashly.gemspec
-RUN gem install bashly*.gem
+RUN gem build bashly.gemspec --output bashly.gem
+RUN gem install bashly.gem
 
 WORKDIR /app
 RUN rm -rf /bashly